TST: skip some tests if scikits is installed but not scipy GH3376
TST: skip some tests if scikits is installed but not scipy GH3376

GuessWhoSamFoo/pandas,winklerand/pandas,linebp/pandas,jreback/pandas,pandas-dev/pandas,zfrenchee/pandas,rs2/pandas,kdebrab/pandas,louispotok/pandas,TomAugspurger/pandas,gfyoung/pandas,datapythonista/pandas,kdebrab/pandas,winklerand/pandas,nmartensen/pandas,MJuddBooth/pandas,Winand/pandas,pandas-dev/pandas,pandas-dev/pandas,GuessWhoSamFoo/pandas,amolkahat/pandas,winklerand/pandas,zfrenchee/pandas,jmmease/pandas,TomAugspurger/pandas,jmmease/pandas,nmartensen/pandas,pratapvardhan/pandas,linebp/pandas,toobaz/pandas,amolkahat/pandas,rs2/pandas,harisbal/pandas,louispotok/pandas,linebp/pandas,winklerand/pandas,DGrady/pandas,toobaz/pandas,cython-testbed/pandas,harisbal/pandas,nmartensen/pandas,rs2/pandas,MJuddBooth/pandas,jmmease/pandas,cython-testbed/pandas,GuessWhoSamFoo/pandas,linebp/pandas,GuessWhoSamFoo/pandas,datapythonista/pandas,nmartensen/pandas,jorisvandenbossche/pandas,pandas-dev/pandas,dsm054/pandas,linebp/pandas,jmmease/pandas,gfyoung/pandas,cython-testbed/pandas,pratapvardhan/pandas,jreback/pandas,DGrady/pandas,jmmease/pandas,gfyoung/pandas,Winand/pandas,toobaz/pandas,kdebrab/pandas,linebp/pandas,harisbal/pandas,nmartensen/pandas,jorisvandenbossche/pandas,louispotok/pandas,rs2/pandas,cython-testbed/pandas,amolkahat/pandas,cbertinato/pandas,cython-testbed/pandas,dsm054/pandas,dsm054/pandas,zfrenchee/pandas,Winand/pandas,MJuddBooth/pandas,amolkahat/pandas,zfrenchee/pandas,TomAugspurger/pandas,pratapvardhan/pandas,gfyoung/pandas,toobaz/pandas,pratapvardhan/pandas,pratapvardhan/pandas,DGrady/pandas,jreback/pandas,cbertinato/pandas,MJuddBooth/pandas,cbertinato/pandas,harisbal/pandas,gfyoung/pandas,amolkahat/pandas,nmartensen/pandas,DGrady/pandas,cbertinato/pandas,MJuddBooth/pandas,jorisvandenbossche/pandas,Winand/pandas,Winand/pandas,jreback/pandas,winklerand/pandas,kdebrab/pandas,louispotok/pandas,TomAugspurger/pandas,jmmease/pandas,cbertinato/pandas,Winand/pandas,toobaz/pandas,datapythonista/pandas,jreback/pandas,winklerand/pandas,DGrady/pandas,dsm054/pandas,datapythonista/pandas,louispotok/pandas,GuessWhoSamFoo/pandas,harisbal/pandas,kdebrab/pandas,jorisvandenbossche/pandas,zfrenchee/pandas,DGrady/pandas,dsm054/pandas